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The seventh grade math classroom exercise book Volume 1 [1] Chapter 3.2 All real number answers are urgent! !
1, serial number: 1, 3,5,6,7,9; 2,4,8

2, (1) root number five, root number five (number to be filled) (2)π, -π (3) root number three.

3、D

4.- 1.5 (with cycle point)

5. Serial number 1

6、6?